J-Security Center

Title: Roaring Penguin PPPoE Denial of Service Vulnerability

Severity: MODERATE

Description:

Roaring Penguin Software's PPPoE is a freeware PPP over Ethernet client often used by ADSL subscribers running Linux or NetBSD.

PPPoE contains a possibly remotely exploitable denial of service vulnerability in its handling of TCP packets when the Clamp_MSS option is used. If PPPoE recieves a malformed TCP packet with a 'zero-length option', PPPoE will go into an infinite loop. As a result, the ppp connection being supported by PPPoE will time out and be terminated. A manual re-start is needed to regain functionality.

This bug has been fixed by Roaring Penguin Software in a new version, see the solutions section.

Affected Products:

  • RedHat Linux 7.0.0
  • Roaring Penguin Software PPPoE 2.0.0
  • Roaring Penguin Software PPPoE 2.1.0
  • Roaring Penguin Software PPPoE 2.2.0
  • Roaring Penguin Software PPPoE 2.3.0
  • Roaring Penguin Software PPPoE 2.4.0

References:

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